Electric fitting



May 31, 1932. l.. B. MANsoN ELECTRIC FITTING Filed Feb. s, 195o PatentedMay 31, 1,932

UNITED STATES PATENT OFFICE LEON B. MANSON, OF CORONA, NEW YORK1ASSIGNORS T0 NOMA ELECTRIC CORPORA- TION, OF NEW YORK, N. Y., ACORPORATION OF NEW YORK rimarcare FITTING Application ,med February 6,1930. Serial No. 426,239.

This invention relates to electric fittings. An object of this inventionis to provide a fitting4 of the character described having imc provedquickly replaceable fuse cartridge means interposed in the currentcarrying portions of the fitting.

A further object of this invention is to pro- `'vide a fitting of thecharacter described having improved means for removably mounting all thecurrent carrying portlons of the fitting as a single unit within asingle housstill further object of this invention is to provide a neat,compact and rugged device of the character described, which shall becomparatively inexpensive to manufacture, com prise fewand simple parts,easy to assemble and replace, and which shall yet be practical andefficient to a. high degree.

Other objects of this invention will in part be obvious and in parthereinafter pointed out.

The invention accordingly consists in the features or construction,combinations of elements, and arrangement of parts which will beexemplified in the construction hereinafter described, and of which thescope of application will be indicated in the following claims.`

In the accompanying drawings, in which is shown one of the variouspossible illustrative embodiments of this invention, Fig. 1 is an axialcross-sectional view of the fitting embodying the invention;

Fig. 2 is a cross-sectional view taken on line 2-2 of Fig. 1; A

Fig. 3 is a cross-sectional view taken on line 3 3 of Fig. I2; and

Fig. 4 is a perspective View of the removable unit mounting the currentcarrying portions of the fitting.

Referring now in detail to the drawings, 10 designates an electricfitting embodying the invention here shown in the form of a two-pieceplug, comprising a screw plug 11 provided with the usual parallelopenings 12 for receiving the contact members or blades 14 and 15 of ablade plug 16.

The plug 16 comprises a tubular housing 17 made of any suitableinsulating material rear end wall 19 formed with a central opcen- 1ng20.A cyllndrical ortion of the interior y mdrlcal surface o said housing 17is threaded as at 21 for the purpose hereinafter described.

In accordance with this invention, all of the current carrying parts forthe plug 16 are mounted on a single block and form a unltary deviceadapted for removable attachment, in the manner hereinafter appearing,as a single complete unit within the housing 17. Said unit, designatedby the reference numeral 25, comprises the block 26 made of insulatingmaterial and provided with threaded portions 27 and 28 at the endsthereof adapted to cooperate with the internal threads 21 of the housing17 Thus, when the block 26 is screwed to the threaded portion 21 of thehousing as shown in Fig. 1, the formerforms a diametric, longitudinalpartition or wall across the interior of said housing and provides spaceon both sides thereof and at the rear and front thereof, for the purposehereinafter described. Said block may be provided with a pair ofsymmetrical recesses or cut out portions 30 and 31 at the ends of therear surface thereof and withv symmetrical recesses 32 and 33 at theends of the front surface thereof. Attached to said block 26 are av pairof symmetrical angular shaped, rearwardly extending metal currentcarrying terminal members 35 and 36 having legs 35a and 36a,respectively, disposed within the recesses 30 and 31. Screws 37 and 38passing thru suitable openings in legs 35a and 36a, respectively, serveto fix said members 35 and 36 to the block. The outwardly extending legs356 and 36?; of members 35 and 36 respectively, are formed with suitableopenings for receiving small screws 40 and 41 for attaching theconductors 40a and 41a of a duplex cable 42 to the fitting. It will benoted that the cable 42 extends into the housing 17 thru the opening 2()in the rear wall 19. Attached to the opposite side of the block are theplug blades 14 and 15, as by screws 44 and 45 extending thru legs 14aand 15a of said blades, said legs being received in the cut out portions32 and preferably open at one end 18 and having a 33 respectively ofsaid block.

Said unit 25 is furthermore provided with quickly replaceable fuse means50 on one side of the block, interconnecting the plug blade 15 withcurrent carrying member 35 and fusc means 51 on the other side of saidblock, interconnecting the plug blade 14 with the curront carryingmember 36. Said means 50 and 51 are substantially similar inconstruction and symmetrically disposed with respect to one another.Means 50 comprises a thin metallic bent strip 52 having an arm 53interposed between said leg 35a and the insulatingr block 26, a portion53a lying flat against a side of the block, and a pair of bifurcatedspring clamping arms 54 extending at right angles to said block. Amember 52a similar in construction to said member 52 is electricallyconnected to the plug blade 15 and is likewise provided with aportioninterposed between the leg 15a of said blade and the insulating block26, a portion lying flat against the side wall ofthe block and a pair ofspring arms aligned with said spring arms 54. A fuse cartridge 55provided with metal caps at the ends thereof is removably attached tothe unit 25 as b v pressing said caps into engagement with the springarms of said members 52, 52a. The fuse means 51 is likewise providedwith metallic bent strip members connected to the member 36 and the plugblade 14 on the opposite side of the block and is also provided with aremovable fuse cartridge 52a similarly clamped and frictionally retainedagainst the side of said block 26.

In practice, the blade unit 25 may be first assembled into a separatecompact device. To assemble the plug 16, the conductor cable 42 is firstinserted thru the opening 30 and attached to the screw members 40 and 41and the block 26 thereafter screwed to the interior of the housing.Should one or both of the fuses blow the entire unit 25 may easily beremoved by unscrewing from the housing 17 and the burnt out fusesreplaced. An insulating disc or plate having openings 61 for receivingthe blades 14 and 15 may be interposed between the plugs 11 and 16, saiddisc preferably extending within the rim of the housing 17 at the end 18thereof.

It will be noted that the fuse cartridges 55 and 55a are disposed onboth sides of the block 26 and extend laterally with respect to the axisof housing 17, thus making for a compact construction. Said cartridgesare hence furthermore completely housed and protected by said housing toprevent tampering or accidental unloosening of said cartridges, and thecurrent carrying portions are well insulated to prevent short circuitswithin the plug.

It will thus be seen that there is provided a device in which theseveral objects' of this invention are achieved, and which is welladapted to meet the conditions of practical use.

As various )ossihle embodiments might be made of the almve invention,andas various changes might be made in the embodiment set forth, it isto be understood that all matter herein set forth or shown in theaccoming parts for said fitting mounted on sald member, whereby all ofthe current carrying parts muy be removed as a unit from said iousmg.

2. A plug comprising a tubular housingr haring a rear wall formed withan opening, an insulating member removably secured within said housing,a pair of terminal members fixed to the rear of said member, a pair ofplug blades fixed to the front of said member, fuses interconnectingsaid blades with said terminal members and a conductor extending intosaid housing thru said opening and secured to said termina-l members.

3. An electric fittin comprising a tubular housing, a substantial?member removably secured Within said housing and diametrically disposedtherein, and a fuse cartridge removably mounted on each side of saidmember.

4. An electric fitting comprising a tubular housing, an insulatingmember removably secured within said housing and diametrically disposedtherein, and a fuse cartridge removably mounted on each side of saidmember, said cartridges being dis osed transversely with respect to thelongitudinal axis of said housing.

5. An electric fitting comprisin a tubular insulating housing having anen wall and being formedwith an internal screw threaded portion, asubstantial] prismatie block made of insulating materia adapted tocooperate with said portion for removably securing said block withinsaid housing, said block forming a longitudinal, diametric partitionacross said housing and current carrying arts for said fitting mountedon said memer.

6. An electric fittingcomprising a tubular insulating housing having aninternal screw threaded portion, a member made of insulating materialadapted to cooperate with said portion for removably securing saidmember within said housing, said member forming a longitudinal partitionwithin said housy prismatic insulating ing, and current carrying partsfor said litting mounted on said member, said parts including acartridge fuse disposed within said housing transversely of thelongitudinal axis of said housing.

7 An electric fitting comprising a tubular insulating housing having aninternal screw threaded portion, a member made of insulating mate-rialadapted to cooperate with said portion for removably securing saidmember within said housing, said member forming a longitudinal partitionwithin said housing and current carrying parts for said tting mounted onsaid member, said parts including a cartridge fuse disposed within saidhousing transversely of the longitudinal axis of said housing, andremovably mounted on said member.

8. An electric `fitting comprising a tubular insulating housing, asubstantially prismatic insulating block removably secured within saidhousing and forming a longitudinal diametric wall across the interior ofsaid housing, a contact member ixed to said block adjacent one endthereof and extending forwardly, a terminal member secured to said blockat the opposite end thereof and extending rearwardly, a fuse cartridge,and spring friction means connected to said contact member and terminalfor removably mounting said fuse on said insulating block.

9. An electric fitting comprising a tubular insulating housing having aninternally screw threaded portion, a substantially flat insulatingmember having partial threads at the ends thereof adapted to co-operatewith said internally screw threaded portion whereby said member forms adiametric partition across the interior of said housing, a pair of plugblades attached to the front of said insulating member adjacent the endsthereof and extending upwardly therefrom, a pair of terminal memberssecured to the rear of said insulating member adjacent the .ends thereofand extending rearwardly therefrom, and a pair of fuse members disposedon opposite sides of said partition member, each interconnecting a bladeadjacent one end of said insulating member with a terminal memberadjacent the opposite end of said insulating member.

10. An electric fitting comprising a tubular insulating housing havingan internally screw threaded ortion, a substantially flat insulating mem)er having partial threads at the end thereof adapted to co-operatewithsaid internally screw threaded portion whereby said member forms adiametric partition across the interior of said housing, a pair of plugblades attached to the front of said insulating member adjacent the endsthereof and extending forwardly therefrom, a pair of terminal memberssecured to the rear of said insulating member adjacent the ends thereofand extending rearwardly there-

